New York City boroughs are indexed as locality records

[orangejulius]

The 5 boroughs of NYC are categorised as PPLA2 records in Geonames. This feature code is not very specific, and includes large cities such as San Diego, which in general map to the locality type in Who's on First.

This causes issues with data correctness in general, and also breaks the labels after #93, which improves the labels in general, but works against us with this already incorrect data.

Right now, we are only able to set the layer of a Geonames record based on feature code, but it seems like we want to add the ability to special case individual records, starting with the 5 records below, and make them be a part of the borough layer.

NYC Boroughs and their Geonames IDs

• Brooklyn 5110302
• Manhattan 5125771
• Queens 5133273
• The Bronx 5110266
• Staten Island 5139568

Stuff to do

• Add borough to the list of geonames layers in API
• Make sure there are tests for this (the layer mapping code already has a nice test suite)

[orangejulius]

This was fixed in #100 and has acceptance tests as part of pelias/acceptance-tests#272. We still have to update the list of layers for Geonames in the API though.